Two New York City hospitals have reached a tentative contract agreement with thousands of striking nurses that ends this week’s walkout that disrupted patient care, officials announced Thursday.

The nurses, represented by the New York State Nurses Association, walked out early Monday after negotiations with management ran aground at Mount Sinai Hospital, in Manhattan, and Montefiore Medical Center, in the Bronx. Each has more than 1,000 beds and 3,500 or more union nurses.

Nurses for both hospitals were to return to work Thursday morning, the union said.

The union has stressed staffing levels as a key concern, saying that nurses who labored through the grueling peak of the coronavirus pandemic are stretched far too thin because too many jobs are open. Nurses say they have had to work overtime, handle twice as many patients as they should, and skip meals and even bathroom breaks.

“Through our unity and by putting it all on the line, we won enforceable safe staffing ratios at both Montefiore and Mount Sinai where nurses went on strike for patient care,” the NYSNA president, Nancy Hagans, said in a statement. “Today, we can return to work with our heads held high, knowing that our victory means safer care for our patients and more sustainable jobs for our profession.”

The privately owned, nonprofit hospitals say they have been grappling with a widespread nursing shortage that was exacerbated by the pandemic.

“Our bargaining team has been working around the clock with NYSNA’s leadership to come to an agreement,” Montefiore said in a statement. “From the outset, we came to the table committed to bargaining in good faith and addressing the issues that were priorities for our nursing staff.”

The hospital said it focused on ensuring the nurses had “the best possible working environment, with significant wage and benefit enhancements” through the deal with the union.

“We know this strike impacted everyone — not just our nurses — and we were committed to coming to a resolution as soon as possible to minimize disruption to patient care,” the hospital said.

A post on Mount Sinai’s website said the hospital was pleased to have reached a tentative agreement with the union. The Associated Press sent an email to a hospital representative seeking comment.

Several other private hospitals around the city reached deals with the union as the strike deadline loomed. The agreements included raises totaling 19 percent over three years.

Mount Sinai and Montefiore said before the strike that they had offered the same pay boosts.